I am needing help with a weight loss or gain formula that will calculate the percentage of gain or loss in a patient over a period of time. For example:
January 130, February 133, March 127. What would be the percentage of gain between January and February and then the percentage of loss between February and March. I would like to calculate a total percentage of loss/gain of all three. I need to make this a running spreadsheet if possible.

Thanks in advance!